Carrier 48/50PD05 manual Service, Carrier Accessory Kits, Two-PositionDamper, Indoor Air Quality

Carrier Accessory Kits

There are specific accessory kits sold for various field installed accessories. These kits vary based on model, size, voltage, manufacture date, and duct orientation. Some of these kits include Economizer, Power Exhaust, and Electric Heat. Refer to the Controls Quick Set-Up section for configuration and more information on these accessories.

Two-Position Damper

The two-position outdoor air damper accessory usage depends on model size and return duct orientation. This accessory wires directly into the low voltage circuit for the indoor fan control. No other control configuration is needed.

Indoor Air Quality

The indoor air quality (IAQ) sensor (part no. 33ZCSENCO2) is a field-installed accessory which measures CO2 levels in the air. When installing this sensor, an ECB board must be installed and the unit must be configured for IAQ use by setting Configuration→AIR.Q→IA.CF to a value of 1, 2, or 3. See the Indoor Air Quality section for more information.

TB1-2 . . . . . . . 4-20 mA Input

TB1-3 . . . . . . . Sensor Common

TB1-R . . . . . . 24 VAC Output

TB1-C . . . . . . Common (GND)

Outdoor Air Quality

The outdoor air quality (OAQ) sensor is a field-installed accessory that measures CO2 levels in the air. When installing this sensor, an ECB board must be installed and the unit must be configured for OAQ use by setting Configuration→AIR.Q→OA.CF to a value of 1 or 2. See the Indoor Air Quality section for more information.

TB1-4 . . . . . . . 4-20 mA Input

TB1-3 . . . . . . . Sensor Common

TB1-R . . . . . . 24 VAC Output

TB1-C . . . . . . Common (GND)

Smoke Detectors

The smoke detectors are field-installed accessories. These detectors can detect smoke in either the return air (part no. CRSMKDET003A00) or supply and return air (part no. CRSMKSUP002A00). When installing either detector, the unit must be configured for fire shutdown by setting Configuration→UNIT→FS.SW to normally open (1) or normally closed (2).

TB1-Fire Shutdown-1 . . . . Dry Contact Source TB1-Fire Shutdown-2 . . . . Discrete Input to Board TB1-R . . . . . . . . . . . . . . . . 24 VAC Output TB1-C . . . . . . . . . . . . . . . . Common (GND)

Filter Status

The filter status accessory (part no. CRSTATUS002B00) is a field-installed accessory. This accessory detects plugged filters. When installing this accessory, the unit must be configured for filter status by setting Configuration→UNIT→FL.SW to normally open (1) or normally closed (2). Normally open (1) is the preferred configuration. Filter status wires are pre-run in the unit harness and located near the switch installation location. Refer to the Filter Accessory Installation Instructions for more information.

Fan Status

The fan status accessory (part no. CRSTATUS003B00) is a field-installed accessory. This accessory detects when the indoor fan is blowing air. When installing this accessory, the unit must be

configured for fan status by setting Configuration→UNIT→FN.SW to normally open (1) or normally closed (2). Normally open (1) is the preferred configuration. Fan status wires are pre-run in the unit harness and located near the switch installation location. Refer to the Fan Accessory Installation Instructions for more information.

IMPORTANT: The Fan Status terminals on TB1 are NOT to be used.

Enthalpy Sensors

The enthalpy accessories (part no. CRENTSNG002A00 and CRENTDIF002A00) are field-installed accessories. The first accessory (outdoor air only) determines when the enthalpy is low relative to a fixed reference. Adding the second accessory (return air) compares the enthalpy between the outdoor and return airstreams. In each case, the enthalpy 4 to 20 mA signals are converted to a switch output which is read by the ECB. When installing this accessory, the unit must be configured for

enthalpy-based control by setting Configuration→ECON→EN.SW to normally open (1). Normal status is an active switch which tells the control that enthalpy is LOW. The actual switch terminal LOW is normally closed. Refer to the Enthalpy Kit Installation Instructions for more information on its installation.

Return/Supply Air Temperature Sensor

The temperature sensor (part no. 33ZCSENSAT) is a field-installed accessory which may be installed on the common return air duct and/or the common supply air duct near the unit. The duct supply air temperature (SAT) may be used to replace the SAT sensor that is internal to the unit. A supply duct SAT measurement is valid for heating mode display while the factory-standard internal SAT is not valid for heating due to its location upstream of the heating section. When installing the supply duct SAT, the unit must be configured by setting Configuration→UNIT→SAT.H to ENBL. A SAT sensor in the supply duct is the preferred configuration for systems with Carrier variable volume and temperature (VVT→) accessory controls.

Space Humidistat

The Space Humidistat (part no. --HL--38MG-029) is a wall mounted device with an adjustable setpoint to control humidity levels. The humidistat input is provided on the field connection terminal board. The Space Humidity Switch configuration, Configuration→UNIT→RH.SW, identifies the normally open or normally closed status of this input at LOW humidity.

TB1-R . . . . . . 24 VAC Dry Contact Source TB1-W2 . . . . . Discrete Input to Board

Space Humidity Sensor

The space relative humidity sensor (part no. 33ZCSENDRH-01 duct mount or 33ZCSENSRH-01 wall mount) is a field-installed accessory. The space relative humidity (RHS) may be selected for use if the outdoor air quality sensor (OAQ) is not used and an economizer board is installed. When installing the relative humidity sensor, the unit must be configured by setting Configuration→UNIT→RH.S to YES.

TB1-1 . . . . . . . 24 VDC Loop Power

TB1-4 . . . . . . . 4-20 mA Input Signal

SERVICE

!WARNING

ELECTRICAL SHOCK HAZARD

Failure to follow this warning could cause personal injury or death.

Before performing service or maintenance operations on unit, turn off main power switch to unit and install lockout tag. Ensure electrical service to rooftop unit agrees with voltage and amperage listed on the unit rating plate.

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